<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div {
            width: 100px;
            height: 100px;
            background-color: blue;
        }

        #container {
            background-color: #d87093;
        }

        .c1 {
            background-color: red;
        }

        .c2 {
            background-color: yellow;
        }

        .c3 {
            background-color: sandybrown;
        }

        .c4 {
            background-color: #FFECE4 !important;
        }

    </style>
</head>
<body>

<!--内联  >  id  >  类、属性、伪类  >  标签、伪元素-->
<!--!important 是对某一具体的样式加到最高级，而对选择器优先级并无影响-->
<div id="container" class="c1 c2 c3 c4"></div>

</body>
</html>
